THE PERSPECTIVE of lenses with a focal length of between 50mm and 90mm is dose to what the human eye can concentrate on. The 85mm fixed-focal-iength lens has long been popular for portrait photography, because the camera-to-subject distance for head-and-shoulders portraits is just right to flatter the proportions of the subject's face. While the shallow depth of field available with these lenses makes them popular for shooting portraits, they work well in any situation where isolating the subject is key Low-light shooting is also helped by a wide aperture, while landscapes and street photographs with shallow depth of field can be particularly effective and unusual.
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